Effects of Seed Rate on Yield and Weed Control of Different Rice Cultivars in Direct-Seeded Conditions

Document Type : Research Paper

Authors

1 university

2 Assist. Prof., Dept. of Plant Production and Genetics, Faculty of Agriculture, Agricultural Sciences and Natural Resources University of Khuzestan

3 Assistant Professor Department of Plant Production and Genetics, Faculty of Agriculture, Khuzestan Agricultural Sciences and Natural Resources University, Khuzestan, Iran

Abstract

Background & Objectives: Weed competition is considered as the most important factor in yield reduction in direct-seeded rice. In integrated weed management, the use of high seed rate and cultivars, in addition to herbicide application, can help to reduce weed biomass in direct-seeded rice.
 
Material and Methods: An experiment was conducted using a factorial design based on a randomized complete block design (RCBD) with three replications in 2021 in Shosh (Mianab district). The first factor included four seed rates (90, 120, 150, and 180 kg/ha), the second factor comprised three rice cultivars (Anberbo, Sherodi, and Zighami), and the third factor was herbicide treatment (application of Bispyribac-sodium herbicide and no herbicide application).
 
Results: The study results indicated that increasing the seed rate led to a decrease in the total biomass of weeds. Under conditions of herbicide application and a seed rate of 180 kg/ha, the lowest weed biomass was recorded (56 g/m2). Conversely, with a seed rate of 90 kg/ha and no herbicide application, the highest biomass was observed (296 g/m2). The total biomass of weeds was also lower in Sherodi than in zighami and Anberbo. The grain yield results also indicated that the Sherodi cultivar had the highest grain yield (4351 kg/ha) under herbicide application, while the Anbarbo cultivar had the lowest grain yield (755 kg/ha) under no herbicide conditions. The grain yield of the Sherodi cultivar in the seed rate treatments of 150 and 180 kg/ha was the highest compared to the other cultivars, with yields of 3658 and 3440 kg/ha, respectively.
 
Conclusion: The findings of this study indicate that the integrated weed management program would benefit from using the Sherodi cultivar and seed rate of 150 kg/ha. It is suggested to achieve optimal yield and reduce weed biomass and reduce production costs in in Direct seeded rice.
 

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References

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Journal of Agricultural Science and Sustainable Production
Volume 35, Issue 2
July 2025
Pages 173-186

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